Valve for pilot light devices



Oct. 18, 1938. E- H, MUELLER 2,133,395

lVALVE FOR PILOT LIGHT DEVICES Filed Nov. l1, 1935 ATTORNEYS Patented Oct. 1 8, 1938 UNITED STATES PATENT OFFICE VALVE FOR PILOT LIGHT DEVICES Ervin H. Mueller, Grosse Pointe Park, Mich. Application November 11, 1935, Serial No. 49,203

1 Claim.

This invention relates to a gas lighter for igniting gas at the burner or burners of gas burning devices and more particularly to a pilot light for igniting the gas at the burners of a gas stove.

An object of the present invention is to provide a device for maintaining a pilot'light which device is so constructed as to facilitate the adjustment and cleaning of the same and also to insure against leakage of gas. A further object is to provide a construction wherein the needle valve of the device is provided with a packing gland and an adjusting nut, the arrangement being such that an interposed spring holds the packing rmly seated and also resists the turning of the nut to prevent loss of adjustment.

A further object is to provide a construction adapted to facilitate cleaning and repair and also to provide for the replacement of the pilot light tube, the arrangement being such that the tube may be readily detached and replaced by one of a different length if so desired. It is also an object to provide a particular construction and arrangement of elements whereby certain advantages in construction, adjustment and operation are secured, and to provide certain other new and useful features in the construction and arrangement of parts, all as hereinafter more fully described, reference being had to the accompanying drawing in which Figure 1 is a diagrammatic plan view of a gas stove;

light device;

Fig. 3 is a view similar to that of Fig. 2 showing a modified construction;

Fig. 4 is a transverse section upon the line 4--l4 of Fig. 2, and

Fig. 5 is a section through an indicator head or combustion chamber of the gas stove and showing a pilot device in side elevation and in operative position relative to said head.

In the drawing Fig. 1 shows an outline plan view of a gas stove with the burners I indicated in position and a central spreader device located centrally between the burners and comprising an ignition chamber 2 and tubes 3 leading therefrom to each of the several burners. Located directly below the head or chamber 2 of the spreader, is the pilot light device embodying the present invention, with the pilot light tube of the device extending upwardly through the bottom of the chamber 2 so that a small gas flame will be maintained within this chamber at all times and when the gas is turned on to one of the burners by means of one of the valves indicated at 4 in Fig. 2 is a vertical sectional detail of a pilot dotted lines in Fig. l to permit gas to ow from the manifold pipe 5 through the air mixer 6 and on to the burner, the gas under pressure will be projected through one of the pipes 3 into the chamber 2 and there be ignited, thus flashing back through the pipe and igniting the gas issuing from that burner.

The device embodying the present invention and as shown in Fig. 2, comprises a head 'I or valve body which is formed at its lower end with a tubular projection 8, the bore of which projection is extended into the body and formed with a tapering inner end to provide a packing gland or seat for packing material 9 and the inner end of this bore is extended as at I0 to receive the end of a needle valve stem II the outer end of which stem is rigidly secured to an adjusting nut I2 sleeved over the tubular projection 8 which is screwthreaded to engage the internal screwthread of the nut. A coiled spring I3 is sleeved upon the needle valve stem or outer end portion thereof between the packing 9 and the outer end wall of the nut I2 and thus by turning the nut upon the tubular projection 8, this spring is depressed or put under tension and forces the packing 9 to firmly seat around the needle valve stem and against the end of the bore of said projection. This spring therefore not only holds the packing to its seat to provide a tight packing gland but also puts a frictional resistance upon the nut I2 to prevent its accidental turning.

The inner end of the bore I0 of the head l is formed with a jet opening vI4 and the tapered end I5 or valve proper of the needle valve is adapted to project into this jet opening I4 and therefore by turning the nut I2 and valve stem the valve I5 is caused to enter the jet opening to seat therein or to be partially retracted therefrom to regulate the size of the jet opening and the amount of gas which will be permitted to flow therethrough, this gas being conducted to the head through a small tube I6, entering the bore I0 through a passage I1 connecting the open end of the tube with said bore.

The jet opening I4 opens into the bore I8 of an externally screwthreaded nipple or tubular projection I9 formed integral with the body I and projecting upwardly therefrom and an internally screwthreaded sleeve 28 is screwed over this nipple I9 and is formed with a tubular extension or pilot light tube 2I adapted to extend upwardly and into the spreader chamber 2 as indicated in Fig. 5. Between the end of the nipple I9 and an internal shoulder at the end of the bore of the sleeve 20, is placed a coiled spring 22, this spring thus exerting a force to frictionally resist the turning of the sleeve 20 upon the nipple I9. 'Ihe nipple I9 is bored transversely to form air inlet openings 23 and like openings are formed in the sleeve 20 to register with these air inlet openings so that by turning the sleeve upon the nipple, the amount of opening provided through these air inlet openings 23 may be regulated and when so turned, this adjustment is held by the action of the spring 22.

A slightly modied construction of the device shown in Fig. 2, is shown in Fig. 3 in that the tubular projection or nipple 8a is formed at the side of the head or body 'I instead of at the lower end thereof as in Fig. 2, and therefore the adjusting nut I2 and needle valve II extend with their axes in a horizontal position and in coincidence with the axis of the supply tube I6a, so that the tapered end I5 of the needle valve will project into a small bore I 'Ia providing communication between the chamber of the head and the supply tube I6a, this small opening being adapted to be closed by the needle valve or the iiow therethrough regulated by an adjustment of said valve and nut I2. The tapered or pointed end of the valve thus extends in the axis of the tube Ia and directly in line with the ow of gas through said tube thus aiording a sure shutoff and regulation of the flow. A nipple I9a is externally screwthreaded at its lower end to screw tightly provided with a jet opening I5a at its axis to perinto the bore Illa of the head and has an end wall mit the gas under pressure from the chamber Ia to pass therethrough into the bore I8a of said nipple. Y

The sleeve a which corresponds to the sleeve 20 of Fig. 2 instead of being form-ed with an integral pilot light tube, is formed with a detachable tube Zla, said tube being formed at its lower end with an external peripheral rib 24a to engage an internal shoulder formed at theY upper end of the bore of the sleeve 20a and the coiled spring 22a is interposed between the end of the nipple I9a and the inner end of said tube to hold the tube rmly seated, this spring also frictionally resisting the turning of the sleeve 20a upon said nipple I9a and thus serving to hold said sleeve in the position to which it is adjusted to adjust the air inlet openings 23a, these openings being adjusted to properly proportion the air to the amount of gas passing through the jet I5a.

By the arrangement of parts shown in Fig. 3, the pilot light tube 2 Ia may be quickly and easily detached to give access to the jet opening and also for the purpose off changing this tube where it is desirable to have a tube of greater length, as when it is desired that this tube shall project further into the spreader chamber 2; and by arranging the needle valve with its axis coinciding with the axis of the supply tube I6a, said valve is positioned in directly opposed relation tothe gas iiow through said tube, and the needle valve is then regulated by the nut I2 which is positioned at the side of the head rather than at its lower end and is therefore more accessible for the purpose of adjustment.

Other changes may be made in the particular arrangement of parts without departing from the spirit of the invention and such changes are contemplated.

Having thus fully described my invention what I claim is:

A valvular device for controlling the admixture of gas and air and the fiow thereof to a central chamber of a pilot light device for gas stoves, which valvular device comprises, a valve body provided with a chamber and a jet opening leading from said chamber and with a projecting and externally screwthreaded nipple, a needle valve to control the flow of gases through said jet opening and having a plain stem extending into said chamber of said body and projecting therefrom, an adjusting nut in screwthreaded and sealing engagement with the projecting and externally screwthreaded nipple on said body and which nut is rigidly secured to the outer end of said valve stem, said projecting and externally screwthreaded nipple on said body being formed with a longitudinal bore through which said stem extends, a packing within the inner end of said bore of said nipple around said stem, a coiled spring sleeved upon said stem between said nut and said packing and adapted to be put under compression by the turning ofY said nut in adjusting said needle valve stem, whereby said spring is effective in holding said nut in the position to which it is turned to adjust said valve stem longitudinally and to hold said packing forced into the inner end of the bore of said nipple through which said valve stem. extends, and a gas supply pipe for supplying gas to said chamber Within said body.

ERVIN H. MUELLER. 

